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hi,
You storage is only 255GB and you datafiles are already 200GB, it seems you have to upgrade your disk array. Current disk system's bottleneck is not its storage capacity, but the io speed limit.
Also consider reorganize the database , i mean reorg the table(move, or exp/imp), rebuild the index, etc.

DIsk I/O or any other tuning is not one step answer
there are many steps to consider from my point
1. init.ora DB_FILE_MULTIBLOCK_READ_COUNT it is
dynamic change with alter system
2.increase db_block_buffer